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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace ByJG\Cache\Psr16;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class SessionCacheEngine extends BaseCacheEngine  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $prefix = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * SessionCacheEngine constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $prefix  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct($prefix = 'cache')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->prefix = $prefix;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function checkSession()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (session_status() == PHP_SESSION_NONE) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            session_start();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function keyName($key)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->prefix . '-' . $key;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function get($key, $default = null)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->checkSession();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $keyName = $this->keyName($key);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->has($key)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $_SESSION[$keyName];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $default;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function delete($key)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->checkSession();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $keyName = $this->keyName($key);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($_SESSION[$keyName])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            unset($_SESSION[$keyName]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($_SESSION["$keyName.ttl"])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            unset($_SESSION["$keyName.ttl"]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function set($key, $value, $ttl = null)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->checkSession();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $keyName = $this->keyName($key);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $_SESSION[$keyName] = $value;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!empty($ttl)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $_SESSION["$keyName.ttl"] = $this->addToNow($ttl);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function clear()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        session_destroy();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function has($key)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $keyName = $this->keyName($key);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($_SESSION[$keyName])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (isset($_SESSION["$keyName.ttl"]) && time() >= $_SESSION["$keyName.ttl"]) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->delete($key);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function isAvailable()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        try { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->checkSession();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } catch (\Exception $ex) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: